EP1633676A1 - Process for preparation of non-hazardous brominating agent - Google Patents
Process for preparation of non-hazardous brominating agentInfo
- Publication number
- EP1633676A1 EP1633676A1 EP03817071A EP03817071A EP1633676A1 EP 1633676 A1 EP1633676 A1 EP 1633676A1 EP 03817071 A EP03817071 A EP 03817071A EP 03817071 A EP03817071 A EP 03817071A EP 1633676 A1 EP1633676 A1 EP 1633676A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixture
- bromine
- bromide
- bromate
- chlorine gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/20—Oxygen compounds of bromine
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/09—Bromine; Hydrogen bromide
- C01B7/096—Bromine
Definitions
- the present invention relates to an improved process for the preparation of non- hazardous brominating reagent.
- This invention particularly relates to the preparation of brominating reagent from the alkaline intermediate bromide-bromate mixture obtained from bromine recovery plants.
- the reagent so obtained is convenient to handle, non-hazardous, easy to transport and can be effectively used in the preparation many aromatic bromo compounds. Background of the invention
- Liquid bromine is used to prepare a variety of brominated compounds through substitution reactions.
- This includes commercially important products such as i) tetrabromobisphenol-A (TBBPA) — a flame retardant, ii) eosin — a pigment used in personal care products, iii) bromoacetanilide — an analgesic and antipyretic agent, iv) tribromophenol — an intermediate used in the manufacture of antiseptic, germicide, fungicide, fire extinguishing fluids, fire retardant. and v) 2-bromo-4-nitro acetanilide — a drug intermediate used in the preparation of nimenslide.
- Brominating agents that are easy to handle are known but are used mainly for more selective transformations or those where bromine is less effective.
- the drawbacks of this method are that the brominating agent requires liquid bromine and hydrobromic acid in its preparation which are corrosive and difficult to handle. (L. F. Fieser and M. Fieser, Reagents for Organic Chemistry Vol. 1, John Wiley, New York, 1967, p967)
- the reagent is costlier than liquid bromine. It involves multi steps making the process less cost benefit
- hypochlorite solution contains chlorate ions as an integral part in considerable levels, which being a strong oxidizing agent in acidic solutions, may take part in the bromination reactions and produce unwanted side products deteriorating the quality of the product.
- the main object of the present invention is to provide an improved process for environmental benign brominating reagent which obviates the drawbacks as detailed above.
- Another object of the present invention is to dispense the use of corrosive liquid bromine in the preparation of brominating reagent.
- Still another object of the present invention is to prepare a brominating reagent from an aqueous alkaline bromine intermediate mixture obtained from bromine recovery plant.
- Yet another object of the present invention is to increase the bromide : bromate ratio in the alkaline bromine mixture from 5 : 1 to 2: 1 in order to maximize the bromine atom .efficiency in aromatic substitution reactions.
- Yet another object of the present invention is to provide a method wherein the bromine discharge in the effluent is minimized i.e. ⁇ 0.5 percent.
- Yet another object of the present invention is to purge inexpensive chlorine gas through alkaline bromine mixture that can oxidize bromide ions to bromate ions in alkaline medium to achieve a stoichiometry of 2: 1 bromide to bromate ratio in the reagent.
- Yet another object of the present invention is to obtain the brominating reagent in solid form which is easy to handle, storage and transport.
- Yet another object of the present invention is to carry out the reactions at ambient temperature in the preparation of the brominating reagent of this invention.
- the aim of the present invention is directed to provide an improved process for the preparation of a non-hazardous brominating reagent with active bromine content in the range 45 to 55 weight percent.
- the alkaline bromine intermediate mixture obtained from bromine recovery plant having bromide to bromate ratio in the range of 4:1 to 5:1 was used.
- the homogeneous mixture of alkaline bromine was purged with commercial chlorine gas in presence of an alkali.
- the overall 2:1 molar combination of bromide to bromate was then achieved in it by suitable dilution with fresh alkaline bromine mixture.
- the temperature of the reaction was maintained between 20 to 40°C.
- the present process is rapid, safe and cost effective giving highly reactive brominating reagent which is easy to handle.
- the present invention provides a process for preparing a non-hazardous brominating reagent by the oxidation of a source of bromide ions to bromate ions, comprising (i) dissolving an alkali in deionized water;
- step (ii) dispersing the source of bromide ions in 0.5 to 2.0 times v/v of deionized water; (iii) purging chlorine gas or flue chlorine gas to the solution of step (ii) above at a rate ranging from 100 to 1000 ml per minute over a period of 6 to 8 hours or till brown colored vapors are evolved; (iv) diluting the mixture with 2 to 3 times (v/v) of alkaline bromine mixture and the rest deionized water till a clear solution of the mixture is obtained; (v) evaporating the mixture to obtain solid product, and drying the product at a temperature in the range of 55 to 80 °C;
- the mixture of (i) and (ii) is stirred at 300 to 400 rpm in order to dissipate the heat generated during the dissolution of alkali salt.
- the source of bromide ions comprises an alkaline bromine intermediate mixture obtained from bromine recovery plant having bromide to bromate ratio in the range 4: 1 to 5 : 1.
- the alkali comprises caustic soda solution and is added to source of bromide ions in a concentration in the range of 2.5 to 2.8 moles per liter of total source of bromide ions.
- the temperature of the reaction mixture is in the range of 20 to 40°C.
- the oxidising agent comprises chlorine gas or flue chlorine gas.
- the oxidizing agent is passed through the mixture of step (ii) at a rate in the range of 100 to 1000 ml per minute.
- the present invention provides a process for the preparation of an non-hazardous brominating agent from a source of bromide ions such as an alkaline bromine intermediate mixture obtained from bromine recovery plant.
- a source of bromide ions such as an alkaline bromine intermediate mixture obtained from bromine recovery plant.
- bromide ions can directly be oxidized to bromate ions in an alkaline medium.
- the acidic protons liberated in this reaction are neutralized (reaction 3) by the alkali present in it.
- the reaction (3) below is governed by the quantity of alkali riod ranging from 6 to 8 hours or till brown colored vapours are evolved.
- the final reaction mixture may be evaporated by known techniques to obtain the desired reagent in solid form.
- bromide ions can directly be oxidized to bromate ions in an alkaline medium.
- the acidic protons liberated in this reaction are neutralized (reaction 3) by the alkali present in it.
- the reaction 3 is governed by the quantity of alkali reddish yellow which is characteristic mark for the right conversion of bromide ion to bromate ion to the desired extent.
- the above said reactions were carried out in 5-10 liters round bottom flasks equipped with three necks and a cooling bath if necessary.
- the alkaline bromine intermediate mixture obtained from bromine recovery plant based on "Cold process” preferably contains from about 18 to 25 wt% of bromide and from about 3 to 7 wt% of bromate and more preferably from about 20 to 22 wt % of bromide and from about 4 to 5 wt% of bromate, was used as a source of bromide ions.
- the oxidizing agent selected was a commercially available chlorine gas or effluent chlorine gas from any industry for example chlor-alkali industry.
- calculated amount of alkali was added to a predetermined volume of alkaline bromine mixture taken in a vessel having stirring facilities and maintaining the temperature at 20 to 40 °C.
- Commercially available chlorine gas was purged through this homogeneous mixture at a regulated flow rate, for a period till brown colored vapours were evolved, while keeping the entire mass under stirring.
- the required bromide to bromate ratio in the oxidized solution was obtained by requisite dilution with fresh alkaline bromine mixture.
- Solid and easy to handle brominating reagent was obtained by evaporation of final reaction mixture, followed by drying and grinding to the desired size.
- the rate of bromide oxidation to bromate is fast in concentrated basic solutions, it is preferable to conduct the reaction by dissolving the alkali in minimum volumes of alkaline bromine and deionised water so as to get the required quantity of bromide conversion and then diluting with suitable quantity of original alkaline bromine mixture to adjust the bromide and bromate ratio 2:1.
- the reaction temperature preferably ranges from about to 15 to 75°C and more preferably are at about ambient temperature (i.e. about 20 to 40°C). Reaction rates are usually rapid even below ambient temperature and at atmospheric pressure.
- the brominating reagent was characterized by determining its bromate and bromide contents by estimating liberated bromine, spectrophotometrically (K. Kumar and D. W. Margerum, Inorg. Chem. 1987, 26, 2706-2711) by measuring the absorbance at 390 nm and using the appropriate molar extinction coefficient ( ⁇ , 167 JVT 1 cm -1 in absence and 522 M "1 cm -1 in the presence of large excess of bromide).
- the standard iodometric volumetric method (A. I. Nogel -4 text book of Quantitative Inorganic Analysis, 3rd Ed. Longman, 1962, p349) was followed to estimate for bromate ions and total bromine content.
- the present invention relates to the preparation non-hazardous and stable brominating reagent suitable for various applications.
- This brominating reagent was prepared from alkaline intermediate bromine mixture by oxidation process using chlorine gas at ambient temperature.
- the water-soluble solid reagent can be efficiently used for aromatic substitution reactions wherein maximum bromine atom efficiency can be achieved.
- the method of the present invention does not require any special devise and the use of hazardous and corrosive liquid bromine is dispensed.
- alkaline intermediate bromine mixture obtained from bromine recovery plants was utilized to prepare solid brominating reagent having high atom efficiency.
- the inventive steps adopted in the present invention are (i) preparing non- hazardous brominating reagent from intermediate mixture obtained from bromine recovery plant which obviates the need of liquid bromine; (ii) the reagent is prepared in the ambient temperature (20-40°C) and does not require cooling below 5°C; (iii) commercially available and/or flue chlorine gas is used for the oxidation of bromide ion to bromate ion; (iv) the volumes of alkaline bromine mixture is reduced by dispensing the use of other oxidants in solution; (v) dilution is affected using deionized water and the need for organic solvents is dispensed.
- Alkaline bromine mixture (1.0 liter) having bromide to bromate ratio 4.4:1 was taken in three necked round bottom flask to which 2.0 liters of deionised water having 13.05 moles of ⁇ aOH was mixed at 25°C under stirring. This reaction mixture was purged with chlorine gas at a rate of 300 ml per minute while maintaining the temperature at 25°C and continuing the purging of chlorine gas till brown colored vapors were evolved. The passing of chlorine gas was stopped and the reaction mixture was transferred to another vessel where it was diluted with 4.0 liters of alkaline bromine mixture and 0.5 liter of deionised water keeping the entire mass under stirring and continued for another 10 minutes.
- the passing of chlorine gas was stopped and the reaction mixture was transferred to another vessel where it was diluted with 7.0 liters of alkaline bromine mixture and 0.5 liter of deionised water keeping the entire mass under stirring and continued for another 10 minutes.
- the solid brominating reagent so formed and having bromide to bromate ratio 2: 1 was separated by evaporating the water by known techniques and drying the product at 70°C.
- the active bromine content was found to be 50.3%.
- Chlorine gas and/or flue chlorine gas can be used as an oxidizing agent which obviates the need of other costly oxidizing agent, hypochlorite and the impurity, chlorate in it.
- the bromide ion present in the intermediate mixture can be oxidized at ambient temperature.
- This reagent is safe to handle, can be easily transported and preserved.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IN2003/000201 WO2004106227A1 (en) | 2003-05-30 | 2003-05-30 | Process for preparation of non-hazardous brominating agent |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1633676A1 true EP1633676A1 (en) | 2006-03-15 |
EP1633676B1 EP1633676B1 (en) | 2008-12-31 |
Family
ID=33485463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03817071A Expired - Lifetime EP1633676B1 (en) | 2003-05-30 | 2003-05-30 | Process for preparation of non-hazardous brominating agent |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1633676B1 (en) |
JP (1) | JP4335207B2 (en) |
CN (1) | CN100425527C (en) |
AT (1) | ATE419220T1 (en) |
AU (1) | AU2003249578B2 (en) |
DE (1) | DE60325654D1 (en) |
IL (1) | IL172280A (en) |
WO (1) | WO2004106227A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1918985B1 (en) | 2006-10-31 | 2010-05-26 | S.O.I.TEC. Silicon on Insulator Technologies S.A. | Methods for characterizing defects on silicon surfaces, etching composition for silicon surfaces and process of treating silicon surfaces with the etching composition |
KR20110120332A (en) * | 2009-02-25 | 2011-11-03 | 카운슬 오브 사이언티픽 앤드 인더스트리얼 리서치 | A process for the eco-friendly preparation of 3??5-dibromo-4-hydroxybenzonitrile |
RU2014147730A (en) * | 2012-09-14 | 2016-11-10 | Асахи Груп Холдингз, Лтд. | METHOD FOR PRODUCING SUGAR AND ETHANOL BY SELECTIVE FERMENTATION |
CN107777668A (en) * | 2017-10-11 | 2018-03-09 | 国家海洋局天津海水淡化与综合利用研究所 | A kind of preparation method of demercuration bromide |
CN115385977A (en) * | 2022-09-02 | 2022-11-25 | 德州学院 | Method for synthesizing bromo-cholesterol derivative |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4650658A (en) * | 1983-05-12 | 1987-03-17 | Nippon Silica Industrial Co., Ltd. | Stable crystals of sodium bromite trihydrate |
IL84830A (en) * | 1987-12-15 | 1995-01-24 | Bromine Compounds Ltd | Alkali and alkaline earth metal bromide and bromate solid mixtures and process for preparation thereof |
CN1034653C (en) * | 1994-09-24 | 1997-04-23 | 河北省长芦大清河盐场 | Method of preparing sodium bromate |
EP1248760B8 (en) * | 2001-01-22 | 2007-11-14 | Council of Scientific and Industrial Research | An eco-friendly method of preparation of high purity tetrabromobisphenol-a |
-
2003
- 2003-05-30 WO PCT/IN2003/000201 patent/WO2004106227A1/en active Application Filing
- 2003-05-30 AU AU2003249578A patent/AU2003249578B2/en not_active Ceased
- 2003-05-30 JP JP2005500180A patent/JP4335207B2/en not_active Expired - Fee Related
- 2003-05-30 CN CNB038265591A patent/CN100425527C/en not_active Expired - Fee Related
- 2003-05-30 EP EP03817071A patent/EP1633676B1/en not_active Expired - Lifetime
- 2003-05-30 AT AT03817071T patent/ATE419220T1/en not_active IP Right Cessation
- 2003-05-30 DE DE60325654T patent/DE60325654D1/en not_active Expired - Lifetime
-
2005
- 2005-11-30 IL IL172280A patent/IL172280A/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2004106227A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN100425527C (en) | 2008-10-15 |
AU2003249578B2 (en) | 2007-12-06 |
IL172280A (en) | 2011-03-31 |
JP4335207B2 (en) | 2009-09-30 |
DE60325654D1 (en) | 2009-02-12 |
CN1835888A (en) | 2006-09-20 |
AU2003249578A1 (en) | 2005-01-21 |
EP1633676B1 (en) | 2008-12-31 |
ATE419220T1 (en) | 2009-01-15 |
WO2004106227A1 (en) | 2004-12-09 |
JP2006525932A (en) | 2006-11-16 |
IL172280A0 (en) | 2006-04-10 |
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